Ski boot



FIG. 1 is a top plan view of a ski boot showing my new design;

FIG. 2 is a left side perspective view thereof;

FIG. 3 is a right side perspective view thereof;

FIG. 4 is a front perspective view thereof;

FIG. 5 is a rear perspective view thereof;

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a ski boot, as shown. 